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You can use any CRT that will fit and has the same base pinout. 10BP4, 10FP4, 12LP4, etc. Bigger issue is mounting and supporting it. You'll also need to modify the HV connector.
Both 5U4 filaments should be wired in parallel. More likely there is leakage between windings than it is open. You could check it if you have a megger or leakage tester. Some devices like the Sencore PR-57 have a leakage tester built in.
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